Hoist



F.- W. KROGER Jan. 3, 1950 HOIST 3 Sheets-Sheet 1 Filed Aug. 12, 1948 INVENTOR- Fredrick W. Kroger BY w zu F. W. KROGER Jan. 3, 1950 HOIST 5 Sheets-Sheet 2 Filed Aug. 12, 1948 Fredrick W Krogei' I N VEN TOR.

F- W. KROGER Jan. 3, 1950 HOIST 3 Sheets-Sheet 5 Filed Aug. 12, 1948 m EM Wm Um WW Qv mw on Q 9 3 m w% OK NV 7. w m T m Fredrick Attorneys Patented Jan. 3, 1950 "'HOIST FndrioWWiKroger;.TrumbullreNebr.

indpplication Angust 12, 1948,"Serial;No:43;821

This-invention relatesto -noveland useful-improvementsin'lifting devices.

' An object 'of 'this'invention is tosup'plyandm- .proved,hoist for use in association with attractor or other primemover which includes a pair of spaced; bra'ckets attached to the draw bar :of "the ,tractor or other vehicle utilized in .connection with thehoist, a'pivot pin secured tosaid' bracket with a i'sleeveland.meanspivottilly securing the sleeve -.t'. the pivot pin,.a piston inthe. sleeve 're- :.,c,1procative ly positioned; a 'condiiit'ior conducting ".fiu'id such asiliquid orair'tolthe lowerportion of l the sleeve in order to urge "the, piston outwardly io'fithe said'sleeve, a, gnideinlthdform ofla pulley attachedtothdfreeentl ofthe said piston and to attach, afieXible member? to the tractor or other prime mover which isentrainedoverthegliide and which mayattachltoia post; .truckibofdy or other suitable element 'to'be' lifted or, towed.

Another object. oftthisinyention is .tqpro'Vide a sectional Ltype. clamp or guide; the sections of .which are hingedly; connected :aridwhich are epositioned .arjound'gthe said sleever arid bracing .lmez'nbers. attached. to the sections.v and Ltoflthe prime mover.

.jAnotheL objectuof this invention is tolso locate .Lthe brace. or v.hraces mentioned ..above.' that they .may 'be -..moved. .in none of several. positions with .respect to ;-.the..sections...of -the clampsthereby ,raising .orJoWering'Zthe sleeve in apivotalifashion. i

Another objectiofathis invention. is lto provide Man extremely.. simplified device of the. character ;to. be. descrihedawhich Jends. litself .w.ell. to. com- .mercial. manufacture. and .which serves, its inntended lfunctionefieetively.

-,Ancillarvl objects and features of "novelty will i become apparent t0,,those skille d inmthe ,-art,. in -.,,fo110Wing--.the rdescriptioniof. .thepreferred ,form :of 2the-invention,I'illustrated .in the. accompanying adrawings mhereinz v Figure Iris-Lan elevationalside.iviewpfuthepre- .ilferred form loft.theiinuentionpshowing its :use in lone environment;

.FigureZlislanelevational side-sliewlshowinglthe v l preierred form=of ethednvention putlto a second use; I

.-e.-Figure.-.3 eis- :alsectional vviewiofa the invention sshown inl'i ure 1; V

; Eigure 451sa sectional-view etaken substantially ornthe .line 4-.4 .of Figureuzandinthe direction ...ofvtlthezarrows;

Figurefiwisasectional view of .Figure 1 and in the direction of the arrows alsportion being broken away;

,. Eigure 6 rise a sectional .view.'btakenzsubstantially (Gl;I298-.1.7

. I *on theline' 6- 6 of -Figure '3 and in the direction of the arrowsend; I Figure 7 -isae perspective'view'of a clip utilized *inconjunction withiithe present invention.

5 The preferred formof the invention-is illus- --'-trated in the accompanying drawings-as being "attachewto a suitable .-'tractor- 'having among other appurtenances contiguous to tractors, 'a

- i draw barindicated-at 10 and-"a rear axle housing loun'dicated'at i2. "-rmaair of brackets 14- and 16 respectively are-"attached? to the parallel -portions of the draw bar andhave upstanding fianges: to *Whicha pivot-pin '8 is attached 'Thispivot' pin may bewigi'dly joined 5 to one of the i brackets :14

Liand 'detachably attached to the other bracket by means of a conve'rition'ak bo1t2-0 or the like.

A sleeve-"22 has 'a bearingbf the sleeve type 24 attached atone end and encircling the said pivot pin I8. This of course pivotally'mounts thesaid *S1eeve 22 I on' the draw bar of the tractor.

I R-eciprocatively mounted inathis sleeve '22 is a piston 1 or- 1 plunger -Q fi which" has 1 bifurcations 28 "at one end thereof. The said bifurcations :have a pin *or shaft fio extending therethrough which j'ournals ap'ulleyfil or other-suitable guide members. Thestructure so far-described constitutes -an-'extensible-'crane or' hoist boom pivoted at its "lower end to the rearward portion-ofa tractor.

The s'aid l'sleeve is- (if course-open endedat one "portion thereof-and is 'cl'osed at theotherend thereof in' order to 'form' a" fluid receiving chamber. This fluid'=rec'eiving chamber is communicated-With a suitable coupling generally indi- "c-ate'd 'at"=34 -whichhas aconduit 36 connected thereto. This conduit eonductsf fiuid from the tractoror the suita'bleprime mover to the fluid chamberin *orden to- 'forc-e the -piston 26' outwardly of the sleeve. The same conduit may be used for the purpose of relieving fiuid' from this 40 "chamber "(unnumbere'cli in-eallowing the piston to =-recede -'within' the: sleeve 22. Of course, "ininstances wherein atwo hose system is'desird, the additionalhose may he-similarlyconnected.

''A flexible member such 'as the' c'able 1032185611 trained aroundlthe pulley or otherl'suitablesguide f 32 and. has:aarpairzof;chainspeach: ofzwhich is'Lin- -.-:dicated at 3 Z-connectedmtone iendsthereof. The 1 terminals of these tchains; are:;. attached to the reinforcing w brackets U44 wand 46 -;-respectively, which are: 11111111111 attached :to; the axle housing :42. .tAny -su-itable attachingmeanszmay beused :such. vas-. the adj ustingqclamps which include; back ,gPlfltGS 5E1. connectedto the brackets by means, of 1. stay holts;5.2.

.55 ,The oppositeoend 'of the said cable lfl'hasa hook 48 attached thereto by the usual means, which hook may be employed for several purposes. Attention is directed to Figure 2 showing the hook 53 and the chain 56 attached thereto, which is in turn positioned around a post 58 which is to be lifted from the ground.

A guide member which is composed of a pair of identical sections 60 connected by means of a hinge pin 62 extending through hinge bights 64,

is provided. Flanges 66 are provided opposite the said bights and a number of bolts 68 extend through the said flanges thereby maintaining the sections in assembled relation.

One of the bolts 88 has a pair of identical braces 10 secured thereto, the opposite ends of which are attached to the said bracing brackets 44 and 45 respectively. Thus, by positioning the braces ill in conjunction with one of the number of bolts 68, the pivotal position of the sleeve 22 may be regulated. It will also be apparent that the braces 10 may remain attached to one of bolts 68 and the position of the guide member 60, 60, along the sleeve 22 may be adjusted by merely loosening bolts 68, sliding the guide member to a desired position and then tightening the bolts. This, of course, adjusts the inclination of the boom.

Noting Figure 1 it will be seen that a dump type trailer having a draft bar 16 attached to the draw bar It is supplied. Accordingly, the trailer may be towed by the tractor and the said hook 53 may be attached to a pair of chains I8 and 80 respectively. These chains are in turn attached to another chain 82 which passes from a position forwardly of the bottom of the truck 84, as shown in Figure 1, under portions of the bottom, and around the side portions to the upper edges thereof.

In order to attach the chain 82 in such a position that it will lend lateral support to the trailer truck 84, a pair of the clips shown in Figure 7 are utilized. These clips include a substantially U- shaped portion 88 having hooks 88 at the free ends thereof and having a cross member 90 connected to the leg of the said U-shaped member 88 adjacent the hooks 88. An additional hook 92 is attached to the cross member 90 and has its curved portion extending in the opposite direction from the said hooks 88. A suitable link in the chain 82 attaches to the said hooks 92 of each clip and the said hooks 88 overlie the upper portions of the side walls of the truck 84.

In operation fluid is applied to the fluid chamber to urge the piston exteriorly of the sleeve thereby carrying with it the guide or pulley 32.

This of course tightens the cable 40 until all the slack is removed and then must lift the element to be hoisted.

It is within the purview of the invention to utilize the same as a towing implement in case of necessity, the elements to be towed simply being attached to the hook 53 or attached to intermediate structural elements which in turn may be attached to the device to be towed.

It is to be particularly observed that hoisting with the present invention is effected solely by movement of the piston and that one end of cable 40 is fixed to a part of the hoist, that is, brackets 44 and 4B. This eliminates complicated winding drums and their drive means normally employed in hoists. The source of power, moreover, is taken from a fluid pump on the tractor which requires only a few simple pipe connections and a control valve, in contradistinction to complicated mechanical power transmissions to wind the cable on a drum or the like.

The fact that the boom may be disposed substantially vertical as shown in Figure 2 and close to the rear axle of the tractor also has certain advantages. It is apparent that when a load is lifted in a vertical direction with a boom substantially vertical, the forces required to resist tilting of the boom are small. Thus, when the boom is in the position shown in Figure 2, the forces in brace members are small in comparison to what they would be had the boom been at a large inclination. Further, the lifting is effected close to the rear wheels of the tractor and the weight of the tractor ahead of the wheels is utilized to counterbalance the lifting forces on the boom to prevent upward rotation of the front of the tractor about its rear axle. The close proximity of the boom to the rear wheels is therefore important since the lifting capacity of the hoist is a function of the distance of appli-- cation of the lifting force rearwardly of the rear axle.

It is apparent that many modifications will become apparent within the purview of the invention. For example, while one type of attachment has been disclosed which effects securement of the hoist to the tractor, this is only exemplary and any other suitable attachment which may be secured to convenient parts of the tractor may be employed. The particular manner in which the inclination of the boom is varied is also subject to modifications. It is not intended, accordingly, to limit the invention to precise details, which have been given only by way of exemplification, except as defined by the scope of the appended claims.

Having described the invention, what is claimed as new is:

1. A hoist for use with a tractor having a draw bar comprising a pair of spaced brackets mounted on the draw bar and a pivot pin secured thereto, a sleeve, means pivotally securing said sleeve to said pivot pin, a piston in said sleeve,

- a flexible member, means securing one end of said flexible member to the tractor, the opposite end adapted to be attached to an element to be towed or lifted, a guide leaving said flexible member entrained therearound attached to said piston, and means secured to said sleeve for introducing and relieving fluid from said sleeve.

2. A hoist for use with a tractor having a draw bar comprising a pair of spaced brackets mounted on the draw bar and a pivot pin secured thereto, a sleeve, means pivotally securing said sleeve to said pivot pin, a piston in said sleeve, a flexible member, means securing one end of said flexible member to the tractor, the opposite end adapted to be attached to an element to be towed or lifted, a guide leaving said flexible member entrained therearound attached to said piston, means secured to said sleeve for introducing and relieving fluid from said sleeve, a support member positioned intermediate the ends of said sleeve, and a brace secured to said sleeve and to the tractor.

3. The combination of claim 2 and said support including a pair of hingedly connected sections each of which having a flange, and threaded elements extending through said flanges maintaining said sections assembled around said sleeve.

4. The combination of claim 3 and said brace attached to one of said threaded elements.

5. The combination of claim 4 and said guide comprising. a rotatively mounted sheave.

6. The combination of claim 5 and a chain attached to the end of said flexible member, clips at the ends of said chain adapted to be secured to a towed or lifted element.

7. A tractor hoist comprising, an attachment adapted to be secured to a tractor and extending rearwardly of its rear axle housing, a hoist boom having a cylinder pivotally secured at its lower end to the attachment for movement in a vertical plane, a piston rod slidable in the cylinder and extending outwardly thereof to render the boom extensible, means connecting the cylinder and tractor to vary the inclination of the boom in said plane relative to the ground, said means also bracing the boom against movement away from said vertical plane, a flexible member adapted to be fixedly secured at one end to a part of the hoist and at its other end to an article to be pulled, the intermediate portion being trained over the outer end of the piston rod, and means for conducting fluid to or from the cylinder, whereby the article to be lifted is moved in response to movement of the piston rod.

8. A portable hoist in accordance with claim 7 wherein said attachment includes -a draft device for use with an article to be towed by the tractor and lifted by the hoist.

9. Apparatus for transporting and dumping material comprising; a trailer truck having a body pivoted on its chassis in such manner that elevating the front end thereof effects dumping of material contained therein at its rear end, a tractor, draft means secured to the tractor extending rearwardly thereof, means connecting the draft means and trailer truck for towing the latter, hoist means including a cylinder pivoted at its bottom on the draft means, a piston rod in the cylinder, a flexible member secured at one end to the tractor and trained over a sheave on the end of the piston rod, means for varying the inclination of the cylinder and piston rod and also bracing the cylinder against lateral movement, whereby the sheave may be disposed substantially above the front end of the trailer truck, means for connecting the other end of the flexible member to the front end of the trailer truck, and means for conducting fluid from and to the cylinder, whereby the position of the piston therein determines the amount of elevation of the front end of the trailer truck.

10. Apparatus in accordance with claim 9 wherein said other end of the cable is connected to the dump truck at spaced points and in such manner that the hoist means and the means for bracing the same on the tractor supports the trailer truck body against lateral movements about its longitudinal axis.

11. Apparatus in accordance with claim 10 wherein said other end of the cable is connected at spaced points to a flexible member which passes under the body and around the sides, the ends thereof being fastened to the top edges of the sides.

12. Apparatus in accordance with claim 11 wherein the ends of the flexible member are connected to the top edges by U-shaped clips, the bight portion of which engage an upper edge of the body.

FREDRICK W. KROGER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,424,425 Spencer Aug. 1, 1922 1,987,052 Choate et al Jan. 8, 1935 2,027,098 Helms Jan. 7, 1936 2,220,450 Howell Nov. 5, 1940 2,258,383 Haniquet Oct. 7, 1941 2,421,472 Way June 3, 1947 FOREIGN PATENTS Number Country Date 273,099 Great Britain 1927 

